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The role of additive and diffusive coupling on the dynamics of neural populations

Marinho A. Lopes, Khalid Hamandi, Jiaxiang Zhang Orcid Logo, Jennifer L. Creaser

Scientific Reports, Volume: 13, Issue: 1, Start page: 4115

Swansea University Author: Jiaxiang Zhang Orcid Logo

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DOI (Published version): 10.1038/s41598-023-30172-3

Abstract

Dynamical models consisting of networks of neural masses commonly assume that the interactions between neural populations are via additive or diffusive coupling. When using the additive coupling, a population's activity is affected by the sum of the activities of neighbouring populations. In co...

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Published in: Scientific Reports
ISSN: 2045-2322
Published: Springer Science and Business Media LLC 2023
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To characterize the seizure dynamics on these networks, we use the escape time, the brain network ictogenicity (BNI) and the node ictogenicity (NI), which are measures of the network's global and local ability to generate seizure activity. Our main result is that the level of ictogenicity of a network is strongly dependent on the coupling function. Overall, we show that networks with additive coupling have a higher propensity to generate seizures than those with diffusive coupling. We find that people with JME have higher additive BNI than controls, which is the hypothesized BNI deviation between groups, while the diffusive BNI provides opposite results. Moreover, we find that the nodes that are more likely to drive seizures in the additive coupling case are more likely to prevent seizures in the diffusive coupling case, and that these features correlate to the node's number of connections. 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spelling 2023-03-27T15:18:17.4449467 v2 62929 2023-03-14 The role of additive and diffusive coupling on the dynamics of neural populations 555e06e0ed9a87608f2d035b3bde3a87 0000-0002-4758-0394 Jiaxiang Zhang Jiaxiang Zhang true false 2023-03-14 MACS Dynamical models consisting of networks of neural masses commonly assume that the interactions between neural populations are via additive or diffusive coupling. When using the additive coupling, a population's activity is affected by the sum of the activities of neighbouring populations. In contrast, when using the diffusive coupling a neural population is affected by the sum of the differences between its activity and the activity of its neighbours. These two coupling functions have been used interchangeably for similar applications. In this study, we show that the choice of coupling can lead to strikingly different brain network dynamics. We focus on a phenomenological model of seizure transitions that has been used both with additive and diffusive coupling in the literature. We consider small networks with two and three nodes, as well as large random and scale-free networks with 64 nodes. We further assess resting-state functional networks inferred from magnetoencephalography (MEG) from people with juvenile myoclonic epilepsy (JME) and healthy controls. To characterize the seizure dynamics on these networks, we use the escape time, the brain network ictogenicity (BNI) and the node ictogenicity (NI), which are measures of the network's global and local ability to generate seizure activity. Our main result is that the level of ictogenicity of a network is strongly dependent on the coupling function. Overall, we show that networks with additive coupling have a higher propensity to generate seizures than those with diffusive coupling. We find that people with JME have higher additive BNI than controls, which is the hypothesized BNI deviation between groups, while the diffusive BNI provides opposite results. Moreover, we find that the nodes that are more likely to drive seizures in the additive coupling case are more likely to prevent seizures in the diffusive coupling case, and that these features correlate to the node's number of connections. Consequently, previous results in the literature involving such models to interrogate functional or structural brain networks could be highly dependent on the choice of coupling. Our results on the MEG functional networks and evidence from the literature suggest that the additive coupling may be a better modeling choice than the diffusive coupling, at least for BNI and NI studies. Thus, we highlight the need to motivate and validate the choice of coupling in future studies involving network models of brain activity. Journal Article Scientific Reports 13 1 4115 Springer Science and Business Media LLC 2045-2322 13 3 2023 2023-03-13 10.1038/s41598-023-30172-3 http://dx.doi.org/10.1038/s41598-023-30172-3 COLLEGE NANME Mathematics and Computer Science School COLLEGE CODE MACS Swansea University Another institution paid the OA fee Wellcome Trust Institutional Strategic Support Fund (ISSF), UK MEG MRC Partnership Grant, Wellcome Trust Strategic Award, BRAIN Unit Infrastructure Award, European Research Council, MRC Skills Development Fellowship, Wellcome Trust 204824/Z/16/Z, MRC/EPSRC, MR/ K005464/1, 104943/Z/14/ Z, UA05, 716321, MR/S019499/1, 104943/Z/14/Z 2023-03-27T15:18:17.4449467 2023-03-14T10:00:05.5210075 Faculty of Science and Engineering School of Mathematics and Computer Science - Computer Science Marinho A. Lopes 1 Khalid Hamandi 2 Jiaxiang Zhang 0000-0002-4758-0394 3 Jennifer L. Creaser 4 62929__26919__02f8bb2e3eff406e81dd5173f0101335.pdf 62929.pdf 2023-03-23T07:50:56.1065130 Output 2899263 application/pdf Version of Record true This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http:// creat iveco mmons. org/ licen ses/ by/4. 0/. false eng http://creativecommons.org/licenses/by/4.0/
title The role of additive and diffusive coupling on the dynamics of neural populations
spellingShingle The role of additive and diffusive coupling on the dynamics of neural populations
Jiaxiang Zhang
title_short The role of additive and diffusive coupling on the dynamics of neural populations
title_full The role of additive and diffusive coupling on the dynamics of neural populations
title_fullStr The role of additive and diffusive coupling on the dynamics of neural populations
title_full_unstemmed The role of additive and diffusive coupling on the dynamics of neural populations
title_sort The role of additive and diffusive coupling on the dynamics of neural populations
author_id_str_mv 555e06e0ed9a87608f2d035b3bde3a87
author_id_fullname_str_mv 555e06e0ed9a87608f2d035b3bde3a87_***_Jiaxiang Zhang
author Jiaxiang Zhang
author2 Marinho A. Lopes
Khalid Hamandi
Jiaxiang Zhang
Jennifer L. Creaser
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container_title Scientific Reports
container_volume 13
container_issue 1
container_start_page 4115
publishDate 2023
institution Swansea University
issn 2045-2322
doi_str_mv 10.1038/s41598-023-30172-3
publisher Springer Science and Business Media LLC
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
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department_str School of Mathematics and Computer Science - Computer Science{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Mathematics and Computer Science - Computer Science
url http://dx.doi.org/10.1038/s41598-023-30172-3
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description Dynamical models consisting of networks of neural masses commonly assume that the interactions between neural populations are via additive or diffusive coupling. When using the additive coupling, a population's activity is affected by the sum of the activities of neighbouring populations. In contrast, when using the diffusive coupling a neural population is affected by the sum of the differences between its activity and the activity of its neighbours. These two coupling functions have been used interchangeably for similar applications. In this study, we show that the choice of coupling can lead to strikingly different brain network dynamics. We focus on a phenomenological model of seizure transitions that has been used both with additive and diffusive coupling in the literature. We consider small networks with two and three nodes, as well as large random and scale-free networks with 64 nodes. We further assess resting-state functional networks inferred from magnetoencephalography (MEG) from people with juvenile myoclonic epilepsy (JME) and healthy controls. To characterize the seizure dynamics on these networks, we use the escape time, the brain network ictogenicity (BNI) and the node ictogenicity (NI), which are measures of the network's global and local ability to generate seizure activity. Our main result is that the level of ictogenicity of a network is strongly dependent on the coupling function. Overall, we show that networks with additive coupling have a higher propensity to generate seizures than those with diffusive coupling. We find that people with JME have higher additive BNI than controls, which is the hypothesized BNI deviation between groups, while the diffusive BNI provides opposite results. Moreover, we find that the nodes that are more likely to drive seizures in the additive coupling case are more likely to prevent seizures in the diffusive coupling case, and that these features correlate to the node's number of connections. Consequently, previous results in the literature involving such models to interrogate functional or structural brain networks could be highly dependent on the choice of coupling. Our results on the MEG functional networks and evidence from the literature suggest that the additive coupling may be a better modeling choice than the diffusive coupling, at least for BNI and NI studies. Thus, we highlight the need to motivate and validate the choice of coupling in future studies involving network models of brain activity.
published_date 2023-03-13T08:20:04Z
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